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An investigation of avoidance by Antarctic krill of RRS James Clark Ross using the Autosub-2 autonomous underwater vehicle

Brierley, A.S; Fernandes, P.G; Brandon, M. A.; Armstrong, F.; Millard, N. W.; McPhail, S. D.; Stevenson, P.; Pebody, M.; Perrett, J.; Squires, M.; Bone, D.G. and Griffiths, G. (2003). An investigation of avoidance by Antarctic krill of RRS James Clark Ross using the Autosub-2 autonomous underwater vehicle. Fisheries Research, 60(2-3) pp. 569–576.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1016/S0165-7836(02)00144-3
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Abstract

The autonomous underwater vehicle (AUV) Autosub-2 was deployed on eight missions ahead of RRS James Clark Ross in the northernWeddell Sea and in the Bransfield Strait, Southern Ocean, to assess avoidance of the research vessel by Antarctic krill Euphausia superba. The AUV was equipped with the same type of scientific echosounder as the research vessel (Simrad EK500 operating at 38 and 120 kHz) and measured the density of krill along transect acoustically (gm−2 wet mass) prior to the ship’s arrival. We hypothesised that if krill avoided the ship, perhaps in response to radiated noise, then the ship should detect less krill than the AUV which is known to have much lower noise levels than the ship. We were unable to detect any significant difference between the density of krill detected by the ship or the AUV, either at the transect level or at finer scales within transects.We conclude, therefore, that avoidance by krill of RRS James Clark Ross will not significantly bias acoustic estimates of krill abundance by this vessel.

Item Type: Journal Article
ISSN: 0165-7836
Keywords: antarctica; krill; autosub
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 9140
Depositing User: Mark Brandon
Date Deposited: 01 Oct 2007
Last Modified: 02 Dec 2010 20:04
URI: http://oro.open.ac.uk/id/eprint/9140
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